Very quickly, because it is not very difficult.
The new British Labour Party leader has sparked off a row over comments that he wouldn't use nuclear weapons as Prime Minister. The row/debate is totally and utterly pointless:
The UK is in NATO; the Americans have nukes; the British wouldn't use
nukes without Washington's approval; under any circumstances where a
British PM might use nukes, if he didn't the Americans certainly would.
Simples. Next manufactured controversy please.